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frr/bgpd/bgp_attr.h

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// SPDX-License-Identifier: GPL-2.0-or-later
/* BGP attributes.
* Copyright (C) 1996, 97, 98 Kunihiro Ishiguro
*/
#ifndef _QUAGGA_BGP_ATTR_H
#define _QUAGGA_BGP_ATTR_H
#include "mpls.h"
#include "bgp_attr_evpn.h"
#include "bgpd/bgp_encap_types.h"
#include "srte.h"
/* Simple bit mapping. */
#define BITMAP_NBBY 8
#define SET_BITMAP(MAP, NUM) \
SET_FLAG(MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
#define CHECK_BITMAP(MAP, NUM) \
CHECK_FLAG(MAP[(NUM) / BITMAP_NBBY], 1 << ((NUM) % BITMAP_NBBY))
#define BGP_MED_MAX UINT32_MAX
/* BGP Attribute type range. */
#define BGP_ATTR_TYPE_RANGE 256
#define BGP_ATTR_BITMAP_SIZE (BGP_ATTR_TYPE_RANGE / BITMAP_NBBY)
/* BGP Attribute flags. */
#define BGP_ATTR_FLAG_OPTIONAL 0x80 /* Attribute is optional. */
#define BGP_ATTR_FLAG_TRANS 0x40 /* Attribute is transitive. */
#define BGP_ATTR_FLAG_PARTIAL 0x20 /* Attribute is partial. */
#define BGP_ATTR_FLAG_EXTLEN 0x10 /* Extended length flag. */
/* BGP attribute header must bigger than 2. */
#define BGP_ATTR_MIN_LEN 3 /* Attribute flag, type length. */
#define BGP_ATTR_DEFAULT_WEIGHT 32768
/* Valid lengths for mp_nexthop_len */
#define BGP_ATTR_NHLEN_IPV4 IPV4_MAX_BYTELEN
#define BGP_ATTR_NHLEN_VPNV4 8+IPV4_MAX_BYTELEN
#define BGP_ATTR_NHLEN_IPV6_GLOBAL IPV6_MAX_BYTELEN
#define BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL (IPV6_MAX_BYTELEN * 2)
#define BGP_ATTR_NHLEN_VPNV6_GLOBAL 8+IPV6_MAX_BYTELEN
#define BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL ((8+IPV6_MAX_BYTELEN) * 2)
/* Prefix SID types */
#define BGP_PREFIX_SID_LABEL_INDEX 1
#define BGP_PREFIX_SID_IPV6 2
#define BGP_PREFIX_SID_ORIGINATOR_SRGB 3
#define BGP_PREFIX_SID_VPN_SID 4
#define BGP_PREFIX_SID_SRV6_L3_SERVICE 5
#define BGP_PREFIX_SID_SRV6_L2_SERVICE 6
#define BGP_PREFIX_SID_LABEL_INDEX_LENGTH 7
#define BGP_PREFIX_SID_IPV6_LENGTH 19
#define BGP_PREFIX_SID_ORIGINATOR_SRGB_LENGTH 6
#define BGP_PREFIX_SID_VPN_SID_LENGTH 19
/* SRv6 Service Sub-TLV types */
#define BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO 1
#define BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_INFO_LENGTH 21
/* SRv6 Service Data Sub-Sub-TLV types */
#define BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE 1
#define BGP_PREFIX_SID_SRV6_L3_SERVICE_SID_STRUCTURE_LENGTH 6
#define BGP_ATTR_NH_AFI(afi, attr) \
((afi != AFI_L2VPN) ? afi : \
((attr->mp_nexthop_len == BGP_ATTR_NHLEN_IPV4) ? AFI_IP : AFI_IP6))
/* PMSI tunnel types (RFC 6514) */
struct bgp_attr_encap_subtlv {
struct bgp_attr_encap_subtlv *next; /* for chaining */
/* Reference count of this attribute. */
unsigned long refcnt;
uint16_t type;
uint16_t length;
uint8_t value[0]; /* will be extended */
};
#ifdef ENABLE_BGP_VNC
/*
* old rfp<->rfapi representation
*/
struct bgp_tea_options {
struct bgp_tea_options *next;
uint8_t options_count;
uint16_t options_length; /* each TLV may be 256 in length */
uint8_t type;
uint8_t length;
void *value; /* pointer to data */
};
#endif
enum pta_type {
PMSI_TNLTYPE_NO_INFO = 0,
PMSI_TNLTYPE_RSVP_TE_P2MP,
PMSI_TNLTYPE_MLDP_P2MP,
PMSI_TNLTYPE_PIM_SSM,
PMSI_TNLTYPE_PIM_SM,
PMSI_TNLTYPE_PIM_BIDIR,
PMSI_TNLTYPE_INGR_REPL,
PMSI_TNLTYPE_MLDP_MP2MP,
PMSI_TNLTYPE_MAX = PMSI_TNLTYPE_MLDP_MP2MP
};
/*
* Prefix-SID type-4
* SRv6-VPN-SID-TLV
* draft-dawra-idr-srv6-vpn-04
*/
struct bgp_attr_srv6_vpn {
unsigned long refcnt;
uint8_t sid_flags;
struct in6_addr sid;
};
/*
* Prefix-SID type-5
* SRv6-L3VPN-Service-TLV
* draft-dawra-idr-srv6-vpn-05
*/
struct bgp_attr_srv6_l3vpn {
unsigned long refcnt;
uint8_t sid_flags;
uint16_t endpoint_behavior;
struct in6_addr sid;
uint8_t loc_block_len;
uint8_t loc_node_len;
uint8_t func_len;
uint8_t arg_len;
uint8_t transposition_len;
uint8_t transposition_offset;
};
/* BGP core attribute structure. */
struct attr {
/* AS Path structure */
struct aspath *aspath;
/* Community structure */
struct community *community;
/* Reference count of this attribute. */
unsigned long refcnt;
/* Flag of attribute is set or not. */
uint64_t flag;
/* Apart from in6_addr, the remaining static attributes */
struct in_addr nexthop;
uint32_t med;
uint32_t local_pref;
ifindex_t nh_ifindex;
/* Path origin attribute */
uint8_t origin;
/* PMSI tunnel type (RFC 6514). */
enum pta_type pmsi_tnl_type;
/* has the route-map changed any attribute?
Used on the peer outbound side. */
uint32_t rmap_change_flags;
/* Multi-Protocol Nexthop, AFI IPv6 */
struct in6_addr mp_nexthop_global;
struct in6_addr mp_nexthop_local;
/* ifIndex corresponding to mp_nexthop_local. */
ifindex_t nh_lla_ifindex;
/* Extended Communities attribute. */
struct ecommunity *ecommunity;
/* Extended Communities attribute. */
struct ecommunity *ipv6_ecommunity;
/* Large Communities attribute. */
struct lcommunity *lcommunity;
/* Route-Reflector Cluster attribute */
struct cluster_list *cluster1;
/* Unknown transitive attribute. */
struct transit *transit;
struct in_addr mp_nexthop_global_in;
/* Aggregator Router ID attribute */
struct in_addr aggregator_addr;
/* Route Reflector Originator attribute */
struct in_addr originator_id;
/* Local weight, not actually an attribute */
uint32_t weight;
/* Aggregator ASN */
as_t aggregator_as;
/* MP Nexthop length */
uint8_t mp_nexthop_len;
/* MP Nexthop preference */
uint8_t mp_nexthop_prefer_global;
/* Static MAC for EVPN */
uint8_t sticky;
/* Flag for default gateway extended community in EVPN */
uint8_t default_gw;
/* NA router flag (R-bit) support in EVPN */
uint8_t router_flag;
/* ES info */
uint8_t es_flags;
/* Path is not "locally-active" on the advertising VTEP. This is
* translated into an ARP-ND ECOM.
*/
#define ATTR_ES_PROXY_ADVERT (1 << 0)
/* Destination ES is present locally. This flag is set on local
* paths and sync paths
*/
#define ATTR_ES_IS_LOCAL (1 << 1)
/* There are one or more non-best paths from ES peers. Note that
* this flag is only set on the local MAC-IP paths in the VNI
* route table (not set in the global routing table). And only
* non-proxy advertisements from an ES peer can result in this
* flag being set.
*/
#define ATTR_ES_PEER_ACTIVE (1 << 2)
/* There are one or more non-best proxy paths from ES peers */
#define ATTR_ES_PEER_PROXY (1 << 3)
/* An ES peer has router bit set - only applicable if
* ATTR_ES_PEER_ACTIVE is set
*/
#define ATTR_ES_PEER_ROUTER (1 << 4)
/* These two flags are only set on L3 routes installed in a
* VRF as a result of EVPN MAC-IP route
* XXX - while splitting up per-family attrs these need to be
* classified as non-EVPN
*/
#define ATTR_ES_L3_NHG_USE (1 << 5)
#define ATTR_ES_L3_NHG_ACTIVE (1 << 6)
#define ATTR_ES_L3_NHG (ATTR_ES_L3_NHG_USE | ATTR_ES_L3_NHG_ACTIVE)
/* route tag */
route_tag_t tag;
/* Label index */
uint32_t label_index;
/* MPLS label */
mpls_label_t label;
/* SRv6 VPN SID */
struct bgp_attr_srv6_vpn *srv6_vpn;
/* SRv6 L3VPN SID */
struct bgp_attr_srv6_l3vpn *srv6_l3vpn;
uint16_t encap_tunneltype; /* grr */
struct bgp_attr_encap_subtlv *encap_subtlvs; /* rfc5512 */
#ifdef ENABLE_BGP_VNC
struct bgp_attr_encap_subtlv *vnc_subtlvs; /* VNC-specific */
#endif
/* EVPN */
struct bgp_route_evpn evpn_overlay;
/* EVPN MAC Mobility sequence number, if any. */
uint32_t mm_seqnum;
/* highest MM sequence number rxed in a MAC-IP route from an
* ES peer (this includes both proxy and non-proxy MAC-IP
* advertisements from ES peers).
* This is only applicable to local paths in the VNI routing
* table and derived from other imported/non-best paths.
*/
uint32_t mm_sync_seqnum;
/* EVPN local router-mac */
struct ethaddr rmac;
/* Distance as applied by Route map */
uint8_t distance;
/* rmap set table */
uint32_t rmap_table_id;
/* Link bandwidth value, if any. */
uint32_t link_bw;
/* EVPN ES */
esi_t esi;
/* SR-TE Color */
uint32_t srte_color;
/* EVPN DF preference and algorithm for DF election on local ESs */
uint16_t df_pref;
uint8_t df_alg;
/* Nexthop type */
enum nexthop_types_t nh_type;
/* If NEXTHOP_TYPE_BLACKHOLE, then blackhole type */
enum blackhole_type bh_type;
/* OTC value if set */
uint32_t otc;
/* AIGP Metric */
uint64_t aigp_metric;
};
/* rmap_change_flags definition */
#define BATTR_RMAP_IPV4_NHOP_CHANGED (1 << 0)
#define BATTR_RMAP_NEXTHOP_PEER_ADDRESS (1 << 1)
#define BATTR_REFLECTED (1 << 2)
#define BATTR_RMAP_NEXTHOP_UNCHANGED (1 << 3)
#define BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED (1 << 4)
#define BATTR_RMAP_IPV6_LL_NHOP_CHANGED (1 << 5)
#define BATTR_RMAP_IPV6_PREFER_GLOBAL_CHANGED (1 << 6)
#define BATTR_RMAP_LINK_BW_SET (1 << 7)
#define BATTR_RMAP_L3VPN_ACCEPT_GRE (1 << 8)
#define BATTR_RMAP_VPNV4_NHOP_CHANGED (1 << 9)
#define BATTR_RMAP_VPNV6_GLOBAL_NHOP_CHANGED (1 << 10)
/* Router Reflector related structure. */
struct cluster_list {
unsigned long refcnt;
int length;
struct in_addr *list;
};
/* Unknown transit attribute. */
struct transit {
unsigned long refcnt;
int length;
uint8_t *val;
};
/* "(void) 0" will generate a compiler error. this is a safety check to
* ensure we're not using a value that exceeds the bit size of attr->flag. */
#define ATTR_FLAG_BIT(X) \
__builtin_choose_expr((X) >= 1 && (X) <= 64, 1ULL << ((X)-1), (void)0)
#define BGP_CLUSTER_LIST_LENGTH(attr) \
(((attr)->flag & ATTR_FLAG_BIT(BGP_ATTR_CLUSTER_LIST)) \
? bgp_attr_get_cluster((attr))->length \
: 0)
enum bgp_attr_parse_ret {
BGP_ATTR_PARSE_PROCEED = 0,
BGP_ATTR_PARSE_ERROR = -1,
BGP_ATTR_PARSE_WITHDRAW = -2,
/* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR
*/
BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3,
BGP_ATTR_PARSE_EOR = -4,
};
struct bpacket_attr_vec_arr;
/* Prototypes. */
extern void bgp_attr_init(void);
extern void bgp_attr_finish(void);
extern enum bgp_attr_parse_ret
bgp_attr_parse(struct peer *peer, struct attr *attr, bgp_size_t size,
struct bgp_nlri *mp_update, struct bgp_nlri *mp_withdraw);
extern struct attr *bgp_attr_intern(struct attr *attr);
extern void bgp_attr_unintern_sub(struct attr *attr);
extern void bgp_attr_unintern(struct attr **pattr);
extern void bgp_attr_flush(struct attr *attr);
extern struct attr *bgp_attr_default_set(struct attr *attr, struct bgp *bgp,
uint8_t origin);
extern struct attr *bgp_attr_aggregate_intern(
struct bgp *bgp, uint8_t origin, struct aspath *aspath,
struct community *community, struct ecommunity *ecommunity,
struct lcommunity *lcommunity, struct bgp_aggregate *aggregate,
uint8_t atomic_aggregate, const struct prefix *p);
extern bgp_size_t bgp_packet_attribute(
struct bgp *bgp, struct peer *peer, struct stream *s, struct attr *attr,
struct bpacket_attr_vec_arr *vecarr, struct prefix *p, afi_t afi,
safi_t safi, struct peer *from, struct prefix_rd *prd,
mpls_label_t *label, uint32_t num_labels, bool addpath_capable,
uint32_t addpath_tx_id, struct bgp_path_info *bpi);
extern void bgp_dump_routes_attr(struct stream *s, struct bgp_path_info *bpi,
const struct prefix *p);
extern bool attrhash_cmp(const void *arg1, const void *arg2);
extern unsigned int attrhash_key_make(const void *p);
extern void attr_show_all(struct vty *vty);
extern unsigned long int attr_count(void);
extern unsigned long int attr_unknown_count(void);
extern void bgp_path_attribute_discard_vty(struct vty *vty, struct peer *peer,
const char *discard_attrs, bool set);
extern void bgp_path_attribute_withdraw_vty(struct vty *vty, struct peer *peer,
const char *withdraw_attrs,
bool set);
extern enum bgp_attr_parse_ret bgp_attr_ignore(struct peer *peer, uint8_t type);
/* Cluster list prototypes. */
extern bool cluster_loop_check(struct cluster_list *cluster,
struct in_addr originator);
/* Below exported for unit-test purposes only */
struct bgp_attr_parser_args {
struct peer *peer;
bgp_size_t length; /* attribute data length; */
bgp_size_t total; /* total length, inc header */
struct attr *attr;
uint8_t type;
uint8_t flags;
uint8_t *startp;
};
extern int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
struct bgp_nlri *mp_update);
extern int bgp_mp_unreach_parse(struct bgp_attr_parser_args *args,
struct bgp_nlri *mp_withdraw);
extern enum bgp_attr_parse_ret
bgp_attr_prefix_sid(struct bgp_attr_parser_args *args);
extern struct bgp_attr_encap_subtlv *
encap_tlv_dup(struct bgp_attr_encap_subtlv *orig);
extern void bgp_attr_flush_encap(struct attr *attr);
extern void bgp_attr_extcom_tunnel_type(struct attr *attr,
bgp_encap_types *tunnel_type);
/**
* Set of functions to encode MP_REACH_NLRI and MP_UNREACH_NLRI attributes.
* Typical call sequence is to call _start(), followed by multiple _prefix(),
* one for each NLRI that needs to be encoded into the UPDATE message, and
* finally the _end() function.
*/
extern size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer,
afi_t afi, safi_t safi,
struct bpacket_attr_vec_arr *vecarr,
struct attr *attr);
extern void bgp_packet_mpattr_prefix(struct stream *s, afi_t afi, safi_t safi,
const struct prefix *p,
const struct prefix_rd *prd,
mpls_label_t *label, uint32_t num_labels,
bool addpath_capable,
uint32_t addpath_tx_id, struct attr *);
extern size_t bgp_packet_mpattr_prefix_size(afi_t afi, safi_t safi,
const struct prefix *p);
extern void bgp_packet_mpattr_end(struct stream *s, size_t sizep);
extern size_t bgp_packet_mpunreach_start(struct stream *s, afi_t afi,
safi_t safi);
extern void bgp_packet_mpunreach_prefix(
struct stream *s, const struct prefix *p, afi_t afi, safi_t safi,
const struct prefix_rd *prd, mpls_label_t *label, uint32_t num_labels,
bool addpath_capable, uint32_t addpath_tx_id, struct attr *attr);
extern void bgp_packet_mpunreach_end(struct stream *s, size_t attrlen_pnt);
extern enum bgp_attr_parse_ret bgp_attr_nexthop_valid(struct peer *peer,
struct attr *attr);
static inline bool bgp_rmap_nhop_changed(uint32_t out_rmap_flags,
uint32_t in_rmap_flags)
{
return ((CHECK_FLAG(out_rmap_flags, BATTR_RMAP_NEXTHOP_PEER_ADDRESS) ||
CHECK_FLAG(out_rmap_flags, BATTR_RMAP_NEXTHOP_UNCHANGED) ||
CHECK_FLAG(out_rmap_flags, BATTR_RMAP_IPV4_NHOP_CHANGED) ||
CHECK_FLAG(out_rmap_flags, BATTR_RMAP_VPNV4_NHOP_CHANGED) ||
CHECK_FLAG(out_rmap_flags,
BATTR_RMAP_VPNV6_GLOBAL_NHOP_CHANGED) ||
CHECK_FLAG(out_rmap_flags,
BATTR_RMAP_IPV6_GLOBAL_NHOP_CHANGED) ||
CHECK_FLAG(out_rmap_flags,
BATTR_RMAP_IPV6_PREFER_GLOBAL_CHANGED) ||
CHECK_FLAG(out_rmap_flags, BATTR_RMAP_IPV6_LL_NHOP_CHANGED) ||
CHECK_FLAG(in_rmap_flags, BATTR_RMAP_NEXTHOP_UNCHANGED))
? true
: false);
}
static inline uint32_t mac_mobility_seqnum(struct attr *attr)
{
return (attr) ? attr->mm_seqnum : 0;
}
static inline enum pta_type bgp_attr_get_pmsi_tnl_type(struct attr *attr)
{
return attr->pmsi_tnl_type;
}
static inline void bgp_attr_set_pmsi_tnl_type(struct attr *attr,
enum pta_type pmsi_tnl_type)
{
attr->pmsi_tnl_type = pmsi_tnl_type;
}
static inline struct ecommunity *
bgp_attr_get_ecommunity(const struct attr *attr)
{
return attr->ecommunity;
}
static inline void bgp_attr_set_ecommunity(struct attr *attr,
struct ecommunity *ecomm)
{
attr->ecommunity = ecomm;
if (ecomm)
SET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES));
else
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES));
}
static inline struct lcommunity *
bgp_attr_get_lcommunity(const struct attr *attr)
{
return attr->lcommunity;
}
static inline void bgp_attr_set_lcommunity(struct attr *attr,
struct lcommunity *lcomm)
{
attr->lcommunity = lcomm;
if (lcomm)
SET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES));
else
UNSET_FLAG(attr->flag,
ATTR_FLAG_BIT(BGP_ATTR_LARGE_COMMUNITIES));
}
static inline struct community *bgp_attr_get_community(const struct attr *attr)
{
return attr->community;
}
static inline void bgp_attr_set_community(struct attr *attr,
struct community *comm)
{
attr->community = comm;
if (comm)
SET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES));
else
UNSET_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_COMMUNITIES));
}
static inline struct ecommunity *
bgp_attr_get_ipv6_ecommunity(const struct attr *attr)
{
return attr->ipv6_ecommunity;
}
static inline void bgp_attr_set_ipv6_ecommunity(struct attr *attr,
struct ecommunity *ipv6_ecomm)
{
attr->ipv6_ecommunity = ipv6_ecomm;
if (ipv6_ecomm)
SET_FLAG(attr->flag,
ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES));
else
UNSET_FLAG(attr->flag,
ATTR_FLAG_BIT(BGP_ATTR_IPV6_EXT_COMMUNITIES));
}
static inline struct transit *bgp_attr_get_transit(const struct attr *attr)
{
return attr->transit;
}
static inline void bgp_attr_set_transit(struct attr *attr,
struct transit *transit)
{
attr->transit = transit;
}
static inline uint64_t bgp_attr_get_aigp_metric(const struct attr *attr)
{
return attr->aigp_metric;
}
static inline void bgp_attr_set_aigp_metric(struct attr *attr, uint64_t aigp)
{
attr->aigp_metric = aigp;
if (aigp)
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_AIGP);
}
static inline struct cluster_list *bgp_attr_get_cluster(const struct attr *attr)
{
return attr->cluster1;
}
static inline void bgp_attr_set_cluster(struct attr *attr,
struct cluster_list *cl)
{
attr->cluster1 = cl;
}
static inline const struct bgp_route_evpn *
bgp_attr_get_evpn_overlay(const struct attr *attr)
{
return &attr->evpn_overlay;
}
static inline void bgp_attr_set_evpn_overlay(struct attr *attr,
struct bgp_route_evpn *eo)
{
memcpy(&attr->evpn_overlay, eo, sizeof(struct bgp_route_evpn));
}
static inline struct bgp_attr_encap_subtlv *
bgp_attr_get_vnc_subtlvs(const struct attr *attr)
{
#ifdef ENABLE_BGP_VNC
return attr->vnc_subtlvs;
#else
return NULL;
#endif
}
static inline void
bgp_attr_set_vnc_subtlvs(struct attr *attr,
struct bgp_attr_encap_subtlv *vnc_subtlvs)
{
#ifdef ENABLE_BGP_VNC
attr->vnc_subtlvs = vnc_subtlvs;
#endif
}
#endif /* _QUAGGA_BGP_ATTR_H */
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